Materials Literature
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The present status of our concepts as to the origin of the structure and behavior of permanent magnet materials now in use is discussed. It is shown that domain theory can at least qualitatively explain the properties of all these permanent magnet materials. In some cases quantitative agreement between theory and obse…
A large number of samples of hexagonal ferrite, with planar anisotropy incorporating various metal ions, were synthesized and tested for FMR (ferromagnetic resonance). Measurements were made at room temperature in transmission cavities at frequencies between 10 and 35 Gc/s on magnetically oriented polycrystalline comp…
The pressure derivatives of the two interchain exchange constants in FeCl2·2H2O and CoCl2·2H2O, and of the interlayer exchange constant in FeCl2 and FeBr2 have been obtained from measurements of the respective metamagnetic transition fields in the temperature range 1°–4°K. Hydrostatic pressure to 4 kbar were generated…
Abstract In order to make the kinetic theory of liquid viscosity tractable, an approximate from is suggested for the perturbation of the radial distribution function of a monatomic liquid by a nonuniform flow field. Substitution of this form into the microscopic expression for the pressure tensor yields an equation fo…
Time-index of refraction isotherms for a borosilicate glass in the transformation region have been established. By comparing two quenched glasses of the same index, one quenched after attaining equilibrium at a given temperature and the other quenched from a temperature at which the specimen was approaching a higher v…
Abstract Nickel catalysts reduced with sodium borohydride have been found to be active for the liquid phase dehydrogenation of isopropanol. The activity, per unit weight of catalyst, is at least as high as that of Raney nickel. Promotion of the new catalyts with small amounts of chromium has been explained by an incre…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Modification of Structures of Ternary Oxides by Cation Substitution. I. Substitution of Strontium for Barium in Barium Ruthenium Oxide and in Barium Iridium OxidePaul C. Donohue, Lewis Katz, and Roland WardCite this: Inorg. Chem. 1966, 5, 3, 335–338Publication Date (Prin…
Some magnetic resonance properties of hydroxyl protons are described for a variety of sugars and derivatives in dimethyl sulfoxide. Spectral information of this kind is shown to be useful, particularly for differentiating between certain types of interconvertible molecular species. For example, a reducing sugar may be…
Abstract The permeability of ethyl cellulose to water vapor and liquid water was measured as a function of temperature. A change of slope was found in the Arrhenius plots at about 50°C., close to the glass transition. The sorption isotherms showed essentially zero heat of mixing in agreement with other workers. The di…
A magnetostatic model for perpendicular anisotropy (i.e., the anisotropy resulting from the rotation of the magnetization out of the plane of the film) is presented on the basis of columnar grain structure in ferromagnetic thin films. The calculation shows that the anisotropy constant is proportional to the square of…
Oxygen diffusion was measured by the sectioning technique on single‐crystal and polycrystalline specimens of Zr 0.858 Ca 0.142 CO 1.858 . The diffusion coefficient, which may be represented by the equation D = 0.01818 +0.068 ‐0.015 exp ‐ (31, 200 × 4300)/ RT cm 2 /sec agrees with that calculated from the electrical co…
Walmsley has suggested a method whereby one can deduce the relative density of states at the Fermi level for spin-up and spin-down electrons. This method compares the shift in Fermi level with applied magnetic field for a magnetic metal with that of a nonmagnetic metal by measuring the voltage induced across the plate…
The six terbium oxide phases whose compositions range between Tb2O3 and TbO2 have been prepared and their magnetic properties measured at temperatures from 1.4° to 300°K. The lower oxide phases (C and B polymorphs of Tb2O3, TbO1.715, TbO1.809, and TbO1.823) were prepared by equilibration at appropriate temperatures an…
Summary The concept of chemical potentials was used to study the solubility of phosphate in a calcareous soil when equilibrium was approached by precipitation. By comparison with results obtained by dissolution of soil phosphate it was demonstrated that precipitation resulted in a considerably greater solubility than…
The nuclear electric quadrupole coupling constant of 59Co in a single crystal of the racemic Co(en)3Cl3·3H2O was determined to be 2.63 Mc/sec from the splitting of the 59Co nuclear magnetic resonance spectrum. The sign of the coupling constant is probably negative from considerations of the contribution of the lattice…
Abstract Poly(vinyl alcohol) single crystal platelets having a stepheight of approximately 100 A. were obtained by isothermal crystallization from dilute triethylene glycol solution. Material crystallized at temperature T c redissolved in the same solvent at a higher temperature T s . A plot of T c versus T s gave a s…
Abstract The effect of small amounts (0.01%–1%) of dimethyl sulfoxide on base‐catalyzed polymerization and equilibration of methylsiloxanes has been examined. The addition of 0.5% of the sulfoxide increases the rate of potassium hydroxide‐catalyzed polymerization of octamethylcyclotetrasiloxane by factors of 100–1000…
A brief review of the ``state of the art'' with emphasis on developments of the past several years is given. It is shown that with but two major exceptions, all significant advancements in energy product enhancement have been achieved by special foundry techniques to promote crystal anisotropy, and not by alloy compos…
The compositional dependence of the magnetoelastic sensitivity of Permalloy films has been studied by a number of investigators, but their results are in disagreement regarding the compositions required for zero magnetostriction, the agreement with bulk values, and the anisotropy of the magnetoelastic coefficients. Th…
The 5000 series nonheat-treatable aluminum magnesium alloys are recognized as superior to other high-strength aluminum alloys for marine applications. However, a potential corrosion and stress corrosion hazard exists in these alloys from intergranular precipitation of a magnesium-aluminum compound. This paper summariz…